well then, I`d go for a GTX 780ti or a TITAN.
But if you have an unlimited Budget, why not buy a whole new system? Or at least Upgrading the RAM to 8GB as well?
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AMD Penom ll 6x 1055T Processor 2.8 GHz // 8GB Ram // XFX Radeon HD 7870 Black Edition DD (2048 MB Memory DDR5, GPU 1055MHz) // Windows 7 Professional 64 Bit Version
Saitek x52 // Saitek Throttle Quadrant // Saitek Pro Flight Rudder Pedals // Track IR 5
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